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12-29-2005, 01:24 AM
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#1 |
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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Exhaust n' Horsepower!!
Hey everyone, Just replaced the stock exhaust on my 82'. I updated it with dual 2 1/4" and Flowmaster 50 series Delta Flows. Unfortunately, I'm an Idiot and forgot my headers when I went to get the exhaust done, 230 miles from home. Anyways, my question is, How much of a horsepower gain do you think my new stuff gave me? It feels like 25, but that could just be because it sounds so tough!
btw, It's a stock 350 with 305 heads, perf. intake perf cam and 1405 carb, accel cap rotor coil. I think these engines were rated at 185hp stock, correct me if I'm wrong, so with what I'm running I figure the truck feels like at least 230hp. Is this a good ballpark guess???
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82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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12-29-2005, 01:42 AM
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#2 |
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Registered User
Join Date: May 2003
Location: Lake Oswego, Oregon
Posts: 1,028
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Re: Exhaust n' Horsepower!!
most exhaust gains are noticed on a high reving, high compression, supercharged or turbo charged motor. i would guess a 5-10 hp gain from a mostly stock motor.
things like smooth bends, length, muffler design, h-pipes, all factor into how well an exhaust will help your motors overall hp.
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Ken Morgan For fun: 1964 Volvo 122 For slow: 1984 Chevrolet C-10 For everything else: 1997 BMW M3 |
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12-29-2005, 02:27 AM
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#3 |
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Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,746
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Re: Exhaust n' Horsepower!!
yup but the sound is killer
__________________
 1984 chevy c10, built 400sb,.(SOLD )77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed  1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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12-29-2005, 01:19 PM
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#4 |
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BeWarE tHe eViL CrAnkTOe!
Join Date: Oct 2002
Location: Yukon, OK
Posts: 3,605
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Re: Exhaust n' Horsepower!!
Yeah I would figure 5-10 hp tops. Its really not a big gain till you get into MUCHO motor mods and or forced induction and such. Then you can see some big gains.
 YOu could always install a TORNADO in there hehehehahahahahahaah!!!
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~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - 1986 Chevy Custom SWB *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods  www.cardomain.com/id/ramairdave AIM Screenname - Jester84 |
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12-29-2005, 08:20 PM
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#5 |
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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Re: Exhaust n' Horsepower!!
I guess when I drop the 383 in is when I'll really notice the difference!!!
__________________
82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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